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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749808f59ced1b530d0c31e6682f318f3db14c909a57e01c19afd70207034da7' 
  AND token = '/slMQonKIvi9zP5tlit5bMcqts/0tzmlbYv6Y2JrGPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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