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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91236739b0f3535900645c21b528c2073719a67061514f5293f4dab02577241e' 
  AND token = '3CdzGRaGgMSiN2AMu8PwPtjLPV6MXc8jPkUyI/IlZ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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