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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf2c1a75b294c941827d9ea4e509d9d980dd94dafbeea55b01c335d3587df7b' 
  AND token = 'Z2HMaKT2PkF1B6fTldsQtBg2F8vHmMHP1huxa8Sv/oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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