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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709e5478d46e51a16a22c7cc32d7d89369b4d3f1cad6c628fdacdf9c03bbfba7' 
  AND token = 'f5il8JWODX42s4oKsBABZPDyoTHNU2JJNhDBiO00LA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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