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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ac269feb32d86d9a8b4fa30b417893ae773265c582e371c678feb11523cd2d' 
  AND token = 'ekcYOWuWW2WYZeUlRozoIdXy5jyrW7UgFz/Yr9oByi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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