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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9acedc68db289a2a9a809b5e6e4daf234ca0f72b64e4029b8f9929fc9ff69c' 
  AND token = 'Q6aXlCbmE7le5aKZFA9ChotfEmPYPnE2ezmWiJxvEQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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