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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdce362d07950c6d56da510e108f72a60587346e60f737a7c3ad0c33ba33243' 
  AND token = 'Nzj1H0yY2Jhqz6maG3+36AGQPCk6ANyaYy9tkk3ISzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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