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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90bec99e76f9bce171cb7d85605df16e297c0d37521da8aba2534eb8b9e1776' 
  AND token = '0t4qyo9g72+9WmFiiXjmXcsRgUDvLGZRxAuH6tzqOMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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