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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564333d52998d9e868a4f99038117093127c6ae31e7b8d17fec9d216be381a4f' 
  AND token = 'm9IsG21hj9PbIVCaJNGV4c5ELzD6p7PPP01tXey5t58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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