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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a861ab2a211cafc07efc572ef45bfda5bc1a67d93f64be76a0af50e8a8fbe046' 
  AND token = '+gFTpTyPj7XHXnM3l4rwZgP0clGVI/5VjKA70MBa5sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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