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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a34c5287802e637d9b636fbfe266c647b704b6aad25874bb6c983f5b741636' 
  AND token = 'Z+lSC5LhAdj5IXdC2LeEtYByAABJLmvmA6Buycuodw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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