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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca198a2ad5ed16d943769130f45aa4a7a8128a0ab5fc6344302dc1211709753' 
  AND token = 'QqK9FGhWQTU1yrSjZ65TR6IUONV63uuZcoPLpVns8+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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