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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6808224660fc4798bc3d5780c26fbaaeb7a45cc0633ce3767dd595b03a3f3a' 
  AND token = 'ue32D+87QcBX0v6yCDGX/gYwGYmkVPMvUuUoaDmt8+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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