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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3574b7e6f5d3fbfe415fcb6c064622b6f219b5384af0a6c63a1a51697a8e0824' 
  AND token = 'T1JSEdGc0KRhSRDL0xHrNHFdZnDpoNL0ktJ6ThuOY8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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