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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c0025bf82b613b2507ceda375458dc7d2659d2d8fef2d74afd38ae1e87cf32' 
  AND token = 'bUvV+m3ddwjQwAslOTXiRBYrIH0RFcPUGOy7oMzRNeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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