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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555967a7e56a200d241a0fe31e57dc01a8e37faf3548701f82a0891aef583bf7' 
  AND token = 'eiY4expJ0MgorCYFyDfz5xoW0uAOnY/cL/CAhp1QbMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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