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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925bb52386d52a9fd7cf0f8ddcb890733f20d21209b4ca0c4dd2520ffb5952d1' 
  AND token = '8nf92CTz80pFA/Fv2RyONjph6DKwUMxf28Orxkqv3HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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