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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0859dfe08e7e8f991ee75c7e3cb77a6eac45cff765e800c60118ae00b4e34bab' 
  AND token = 'wvuxcHB4u8v6l3hY5gaIJyQYWd7dDQc80mV61hPovEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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