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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5dff9913c0a0e7658fc0c8f979614da1e9eac2c875ec3cd4e9bc30f86201e3' 
  AND token = 'majyvUDi8rsj5L0N/nihN/xwNjGjZb66PTWhK3rv8UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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