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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1459b82e3e3656610c2054626a543883ca866780dd1aa50dfcee077b06d656b1' 
  AND token = 'bzWntxt5kP7EDK4LFP8/u1QFHywws18eiz+V03yBSkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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