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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76747bf714f42db3275824e42fa8f79709b90ce04a31e0a9e74e56f97656449' 
  AND token = 'mXyPs2MxkfGqR7hl6//w2wfPfKV8OfMbDk8xYh0XvDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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