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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fee0f88045684ba4b958b777d8b0b54a8694ccd242ae252fe05988411869519' 
  AND token = '8oi98HAz8FrWgNW+ol/cXD4CLoJzaz3A9ZqxWx7LwGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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