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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23d1d15ce215226bac3c68f74eaaafa6c42e66130d44714223caa58f6bfa00c' 
  AND token = 'n92NXum43iCWCM8nbs7r14SezcH088CgBqw1cnHMVnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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