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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c872179678bea8b2610342d10cf01fea231bc0be93596863e4b9ff0c79a476' 
  AND token = 'Q1QyUk5KjZ7PAm5YD0IeO0qR+Sdn4ZMBb5+q7uJ5wB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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