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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc800f3a1788554cd15bd2d6c6ac82c90b81391ae5a8f6e7e95a7408b887fdd' 
  AND token = 'UAGbpBaKoCwvs5t+k3lizgw6kbmP9BZxyKDkngo357U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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