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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be6eb7a1914fbd9990ba018f55ca02a84dc7a22906afd940a2473b9a31cc139' 
  AND token = 'g9amqUMiD4fGiGxCZtFDQ4wfgTn54F8F/55+TJk2tpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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