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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ffb5fff1edcd3ae679d8645f899e1b9f8f8cab6a7a9b7a02e4e03e82ed15b1' 
  AND token = 'djmb4rG+2VGpMT6QqF3aZyijqz/HqyaNV9UdlGho6ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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