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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5e3da8b3b6186eb87ad11c3e23564983a31c5ce0b6789a2ae2d440a4a0b44c' 
  AND token = '5XMVPeyJleL6hGWPk0iVFvOkW7iC2p4oBRRaxdjAbOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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