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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234720f12b30bd54084edc7fa6e3823e9d2c97529e69f87ba87302bf82c2a8ba' 
  AND token = '7qjJAaxMXPA0dhomdMaqy957Vdg0EhZC5lFyZp69Nb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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