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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dafedeb0bbf969a3e17467d4c5f2e5f9d098e342e7adc0c0f8d41e010412a8c' 
  AND token = 'JuNB8WaVEZExbhdbQaV4Lbg1PdYWx9QBQH59vWKohcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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