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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b846dd5f825f557b09ca53e164baae4a142a5c5d5f7d6f7e0b10c79e9f45e87' 
  AND token = 'm33Phqg/0c2Y1E2wNxb2DhzAstqPkN11+fwKfqs8V9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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