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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d91c559952d8b8c9ee898be64a1b731f5338d3a9da055f819071c8173d5f64' 
  AND token = 'E9gDl0n6vUaz+wGD1Ptta87/UnOlZ39tzqayYSFzmhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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