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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb485bf6a5df0550ade56de172897d8f4e1ef56fb83b630d1d5735a700e2f3e0' 
  AND token = '0yPcPngKv5YQujIOsnzMqU+jMYCqY25iW5l/1DHBLMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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