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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e5bc56f184014e2e841615c07a28140f706c80894ac5b09896567a84431031' 
  AND token = 'H1uRlKnaay99ybsE0M6Gt/H4zT84kNANC9p7xNVO5fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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