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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553a2408244bdb30203e9d4e418d9ccb3646fb3fb2d8bad47343336b68b209c4' 
  AND token = 'IVODKu86zEycJO1hx3ZThNv9Q1m24+aoFYQbW8RDutY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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