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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3cf53d6a967ce4d43eab1d6586f3e98b493fb881bf34a5354de084836aea54' 
  AND token = 'Yat7R3NliDR85e33n0Tbj1J5/RMOjYk1zKiWKly8c/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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