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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3a14b9e1df206cfbc3c8f0f7704f01904c65b6e10f1e51bee8452519fb72fb' 
  AND token = 'SdcB/kvcYyqVFKAeXAv0N0Z/Y+b1vKRuBRqujLwcQuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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