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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f90ab4a68f80c3873a1ecd877498c96ce955281f1d80fdbb6d7156e05c1e0f1' 
  AND token = 'IP0bGo4HW+HpVELvdVZyqoMMPt4hyLpuY3LG9Mwm3Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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