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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13877554080f6759dbfd283e93228232af9863d0f61f60779b5cbbd13330609' 
  AND token = '0orNDdh0IIH2z2g9T4cXl+eU/WgWzcSIUY4mjSkAxJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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