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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4023f48a345a8a817f87b82c9c4e9447124cfd01370f5e6a8046aae398291856' 
  AND token = 'LuifgI26olUqUjphGcG+LdaT001N2X7PQ+zZFQG5s9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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