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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd98f7b0bc15f56dd0a7f3ae607a1489b4824722390eff1dbdfa48f7ab7dc1e' 
  AND token = 'HnkhqpPhED2xQOLEre2+gjcAMq7g6O4X0ru2d5JlJ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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