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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f8a5ebf1909b1582a8207f8678f5562a3f4f740de84a72e51425a1527cc4e2' 
  AND token = 'ntDnoUuYlsPoeNLxKF1WNpTWNcggbfpxNAGHz37GOfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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