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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c956c21a12a3738dea28a95ae89d94fac6952888d50fab38525eba9aec74c219' 
  AND token = '4QbGw5l5Gl1M4xm5PvUg9vFlC7sS3E1fG1meKAkNs6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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