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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ed737cf02a78a0da31287b3d2010937ca1894413fd2c3aac66996c397e6022' 
  AND token = 'YuN7RLc3gUHhDAM5AQT+t7bUvfNtXZy1smzni2t66gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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