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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13d680c36f858aa0b238cb955bc6f5e2efaf1d960c65b6a7b96aa72d5cd37b5' 
  AND token = 'JYIjuufVqLWJpiRO7JNLSjwTORqJLeT2laUeo3T/vFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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