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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5521add774167150b651047c0db02c08079747edfdb569ba1b1b6fac28d761' 
  AND token = 'AIPmIOvwqBAXnk8HyZ6bLuZElva7Icb0D2rSjz+vIr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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