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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee9f1a2de70f905094dbe780cd28caa8ef8c33136a8801673ae5f97bb13e495' 
  AND token = 'MNNU2kV5lBWTIiKdpQtH3wpWXv6tTx/qqkXbF0RePgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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