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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe52037e19ef83b3ae2c1f3b2ad22fc845ffca0e80c083164e16ae61df9648ca' 
  AND token = 'Y7IuUFw86tBI8V3t2L+FciFaTa42PVr5ijJ7w3YSNXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}