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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfd99b26bc97026a06e7145178f33bcb8e65d1d50a24c3861a7a8e0bc04cefd' 
  AND token = 'gSgvbU5E7k4DELBK4h0jd8EpAqUrkAp0zbmRpbw/NoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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