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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3e4e4570e0db79e00e0c7901c225b09237c9b9aac9c60d96bffb4bbd5f904f' 
  AND token = 'Sg78Am+JVAJyPvN25UHxm2noch1JrjYrDZX0r4O9Y68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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