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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82526270398dc06a5ed04d88cfce3193a08760d7db292f1eb5b47c0f902c232' 
  AND token = 'VAUivW1S/b7LcIqe09u7VNdcsQipMdZft6P9WMMUKnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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