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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c0a97d91ec97c40d00756daadae537eb7559348f8160ba8ce1c2af8b7186fd' 
  AND token = 'J4F7fYwm1gRzsAIxhalrxyOBf2Y1WXlBVXAoYbgeOOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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