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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fad83a22982d5343903b393bd08b6d18c8adb746a9e5bcf98b1b4d4c65f7db' 
  AND token = 'lj07sbgaecxH4mmmSQ76ONWbNmWIzW0PyHc65vb+B2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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