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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc15feb6e33a88b2ee59519bb19cf7cff940e6742e038d44b8c6d50a1d7449d' 
  AND token = 'TqMpgz8rcTSiG8/eyOlIu8YrcnTMuD0oMf1vha1gVh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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