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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c232aa45ef51e2c38933e1783c531c58c5607de72a5a96669e09d9e7c0c0db' 
  AND token = 'HmETH2VKJAg3baCNrHZ33colJZRmULYKx/wTjH6D9CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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