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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd147b549b96d3861fe762b245e820dd73a3f2f43e2eb383f182fa3e9dc4bbbb0' 
  AND token = 'Tz47COun5oCKOt4uAQl6Zr7sBBnUjaToLkacpI9kE7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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