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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ece9584e45836f84c95e4b8e2e861f5a80d312cb7b4f5c2d3bdbf7b5def6ad' 
  AND token = 'TFKyKkpap5Kax6BwSbz1A02o+ynGpXqESVi2JL2arvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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