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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b9b98c59c4c6745373fa65c9f9442494949943a350a8ba05bd0b3baf3d3e4a' 
  AND token = 'pYX5OE8UBBQ/iwVlen78KtHb+tUc/nuudAyirP316q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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