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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbad0b69f41c3ca0a8041004bf020dfc89adaa88078c8260d1c78546ad8c12e' 
  AND token = 'vRKd0mwz7wQteASIU7bma/nt34Y/moLXxE1ptcpDO8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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