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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39809b15be12e28cad166bf85c99f9d2a3ecc8d93e31d3cf5e117e045723e8d9' 
  AND token = 'IEN6aW89fI4C6qCebPFktaeRvVuhXWSTi1xa1QGmXmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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