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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf0f8c737000d5a4663285d12f64b1cd1a94d7f7f8443cff75cd1c1cd5dd748' 
  AND token = 'B4xKRWeP+UwboZuXnufHWb6z7VndZb/wlDK2NXP0uT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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