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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3239aa32d8ecc8959942a6f55a2c448db3d70d299fe0144e4af2640fecf1a48a' 
  AND token = 'EU7tIiSRrmizcHzVe3JNCoxyhrQVTSOd5xTd2CVnb5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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