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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929fe83514c7225144dd4a4591170e995b34a8667b809acc9c452aeec5e1dd8b' 
  AND token = 'ADsF5ml6AwTBQavm0CCtyQksSHkui36r+gj5ltfx7Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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