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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482d7d092a3239d0d35fb5e7910845019eb26e556545dc13c9763698f3d6c8de' 
  AND token = 'B1tvie0elNYZGZoInyl5fF6fHeZOn/jyALo8Q4SpKPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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