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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d95af3d6e6da0712214a67b04f491a22d09f5e71c8966954b074ce45abe447' 
  AND token = '4p1AHZiy13qvUDSaLhs1/ZSdcgWl+ye3oI3SRiRP7IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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